Xamarin AlarmManager Android

我已经创建了一个快速的xamarin android项目。 最后我想学习下面的学习并将它应用到android和ios之间共享的xamarin表单项目中。 现在我只关注Android方面的事情。

我一直在努力学习如何安排本地通知在将来的某个时间出现。 快速扔掉应用程序，下面是我编写的AlarmReceiver类，以及下面的MainActivity.cs。

class AlarmReceiver : BroadcastReceiver { public override void OnReceive(Context context, Intent intent) { var message = intent.GetStringExtra("message"); var title = intent.GetStringExtra("title"); var notIntent = new Intent(context, typeof(MainActivity)); var contentIntent = PendingIntent.GetActivity(context, 0, notIntent, PendingIntentFlags.CancelCurrent); var manager = NotificationManager.FromContext(context); //Generate a notification with just short text and small icon var builder = new Notification.Builder(context) .SetContentIntent(contentIntent) .SetContentTitle(title) .SetContentText(message) .SetWhen(Java.Lang.JavaSystem.CurrentTimeMillis()) .SetAutoCancel(true); var notification = builder.Build(); manager.Notify(0, notification); } } public class MainActivity : Activity { // Unique ID for our notification: private static readonly int ButtonClickNotificationId = 1000; // Number of times the button is tapped (starts with first tap): private int count = 1; protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); SetContentView(Resource.Layout.Main); // Display the "Hello World, Click Me!" button and register its event handler: Button button = FindViewById(Resource.Id.MyButton); button.Click += ButtonOnClick; } // Handler for button click events. private void ButtonOnClick(object sender, EventArgs eventArgs) { Intent alarmIntent = new Intent(Application.Context, typeof(AlarmReceiver)); alarmIntent.PutExtra("message", "This is my test message!"); alarmIntent.PutExtra("title", "This is my test title!"); PendingIntent pendingIntent = PendingIntent.GetBroadcast(Application.Context, 0, alarmIntent, PendingIntentFlags.UpdateCurrent); AlarmManager alarmManager = (AlarmManager)Application.Context.GetSystemService(Context.AlarmService); alarmManager.Set(AlarmType.ElapsedRealtime, SystemClock.ElapsedRealtime() + 1 * 1000, pendingIntent); } } 

当我逐步调试它时，似乎没有调用我的OnReceive方法。

我正在关注这篇文章，因为我很难通过谷歌搜索来研究如何正确地做到这一点。 这里： 预定通知

如果有人可以分享一些智慧，那将非常感激。

Answer 1

问题是您的BroadcastReceiver没有[BroadcastReceiver ]属性。

此代码有效：

AlarmReceiver.cs

 [BroadcastReceiver] public class AlarmReceiver : BroadcastReceiver { public override void OnReceive(Context context, Intent intent) { var message = intent.GetStringExtra("message"); var title = intent.GetStringExtra("title"); var resultIntent = new Intent(context, typeof(MainActivity)); resultIntent.SetFlags(ActivityFlags.NewTask | ActivityFlags.ClearTask); var pending = PendingIntent.GetActivity(context, 0, resultIntent, PendingIntentFlags.CancelCurrent); var builder = new Notification.Builder(context) .SetContentTitle(title) .SetContentText(message) .SetSmallIcon(Resource.Drawable.Icon) .SetDefaults(NotificationDefaults.All); builder.SetContentIntent(pending); var notification = builder.Build(); var manager = NotificationManager.FromContext(context); manager.Notify(1337, notification); } } 

MainActivity.cs

 [Activity(Label = "App3", MainLauncher = true, Icon = "@drawable/icon")] public class MainActivity : Activity { protected override void OnCreate(Bundle bundle) { base.OnCreate(bundle); SetContentView(Resource.Layout.Main); var button = FindViewById(Resource.Id.MyButton); button.Click += delegate { var alarmIntent = new Intent(this, typeof(AlarmReceiver)); alarmIntent.PutExtra("title", "Hello"); alarmIntent.PutExtra("message", "World!"); var pending = PendingIntent.GetBroadcast(this, 0, alarmIntent, PendingIntentFlags.UpdateCurrent); var alarmManager = GetSystemService(AlarmService).JavaCast(); alarmManager.Set(AlarmType.ElapsedRealtime, SystemClock.ElapsedRealtime() + 5*1000, pending); }; } }